Microorganisms associated with the spider mite predator Metaseiulus (= Typhlodromus) occidentalis: Electron microscope observations

Two morphologically distinct forms of microorganisms were observed with the electron microscope in the tissues of the phytoseiid mite Metaseiulus (= Typhlodromus) occidentalis. The forms were distinguished on the basis of cell wall structure and cytoplasmic inclusions. One microorganism, designated type A, was observed in all mites examined. The second microorganism, type B, was observed in approximately two-thirds of the mites examined. If present, type B microorganisms occurred in all ovaries and egges, suggesting that transovarial transmission may take place. In some mites large numbers of type B microorganisms were observed within Malpighian tubule lumens and in a rectal plug. Whether this population was primarily or secondarily associated with a pathology is discussed.